Gas Turbine Power Augmentation by Overspray Inlet Fogging
Publication: Journal of Energy Engineering
Volume 133, Issue 4
Abstract
The power output of a gas turbine (GT) is highly affected by ambient temperature. A higher ambient temperature will result in a lower power output, due to reduced inlet air density and mass flow rate. Therefore, GT power loss can be recovered by cooling the inlet air. Due to compression with intercooling, overspray inlet fogging (wet compression) can increase power more than using only evaporative inlet cooling. It can also be used to recover aircraft thrust loss due to high ambient temperature operation, or to boost takeoff thrust. This paper is focused on the effects of adding an overspray inlet fogging system to an existing GT power plant. Simulation runs were made for adding an overspray inlet fogging system to a GE 7111EA GT engine to compare with the baseline case (28.2°C, 75.7% relative humidity). Power augmentation using evaporative and overspray inlet fogging can range from 1.85 to , which amounts to a 2.5–22.4% power increase. Moreover, the net efficiency is also increased by 1.62%. Therefore, overspray inlet fogging is capable of both boosting the GT power and improving the efficiency. Results from this study can be used as a guideline for GT power augmentation by overspray inlet fogging.
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Acknowledgments
The writers gratefully acknowledge Dr. Norm Decker and Dr. G. T. Chen of THERMOFLOW Inc. for their assistance in the model set up and thermal performance simulation in this paper. The writers would also like to thank the Taiwan Power Research Institute, Taiwan Power Company, for their support for this paper.
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Information & Authors
Information
Published In
Journal of Energy Engineering
Volume 133 • Issue 4 • December 2007
Pages: 224 - 235
Copyright
© 2007 ASCE.
History
Received: Oct 30, 2006
Accepted: Mar 14, 2007
Published online: Dec 1, 2007
Published in print: Dec 2007
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